Steam cylinder and piston



(No Model.)

W. HANNA.

STEAM CYLINDER AND PISTON.

No. 254,309. Patented Feb. 28,1882.

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UNITED STATES WILLIAM HANNA, OF GILROY, CALIFORNIA.

PATENT OFFICE.

STEAM CYLINDER AND PISTON.

SPECIFICATION forming part of Letters Patent No. 254,309, dated February28, 1882. Application filed October 17, 1881. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM HANNA, of Gilroy, in the county of SantaClara and State of California, have invented a new and usefulImprovement in Steam-Cylinders and Pistons, of which the following is afull, clear, and exact specification.

The object of my invention is to obviate concussion in the operation ofpistons in steamcylinders; and to this end my invention consists inaspring-cushion applied to the pistonroll, all as hereinafter describedand claimed.

Reference is to be had to the accompanying drawing, forming part of thisspecification, which 1s a longitudinal section of a cylinder containingmy improvements.

A is the cylinder, having steam-ports (b a, as usual.

B is the piston, fixed on a tubular rod, 0, that works throughstuffing-boxes in both oyl inder-heads.

D is a rod, extending through and carrying the rod 0 and piston, andwhich is to connect to the crank.

On the rod D, near the ends of tube 0, are nuts or screw-collars 0,between which and the ends of the tube are spiral springs b. Thesesprings are adjusted in their tension by turning the nuts 0, and allowendwise movement of the tube on therod D under the steam-pressure.

The cylinder A is provided near each end with a U-shape steam port orpipe, (1, opening at both ends into the cylinder, and fitted in the endmost distant from the cylinder-heads with a check-valve, 0, openingoutward. The ports d are placed in such relation to steamports a thatthey are open at opposite sides of the piston B when the piston coversthe port a, and before it has reached the end of the stroke, thusfurnishing a pa'ssage'forlive steam from behind the piston to the frontfor cushioning the piston.

In operation, as the piston starts forward by the inlet of steam, therod D is started; but the full force is not expended on the rod untilthe spring!) is compressed, thus relieving the rod of sudden jerks. Whenthe piston nears the end of its stroke, it is cushioned by the steampassing in front of it. It will be seen that this steam is taken fromthat in use, and the volume of steam used for cushioning, instead ofbeing immediately exhausted, remains to start the piston back, thuseffecting a saving.

Having thus described my invention, I claim as new and desire to secureby Letters Patent The combination, with cylinder A and piston-rod D, oftube 0, piston B, nuts 0, and springs b, substantially as and for thepurposes set forth.

WILLIAM HANNA.

Witnesses:

ADAM RIEHL, CHARLES S. ADAMS.

